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/*
** Copyright 2006, The Android Open Source Project
**
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
**
** http://www.apache.org/licenses/LICENSE-2.0
**
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*/
#include <errno.h>
#include <fcntl.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/socket.h>
#include <sys/select.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <netdb.h>
#include <cutils/sockets.h>
static int toggle_O_NONBLOCK(int s) {
int flags = fcntl(s, F_GETFL);
if (flags == -1 || fcntl(s, F_SETFL, flags ^ O_NONBLOCK) == -1) {
close(s);
return -1;
}
return s;
}
// Connect to the given host and port.
// 'timeout' is in seconds (0 for no timeout).
// Returns a file descriptor or -1 on error.
// On error, check *getaddrinfo_error (for use with gai_strerror) first;
// if that's 0, use errno instead.
int socket_network_client_timeout(const char* host, int port, int type, int timeout,
int* getaddrinfo_error) {
struct addrinfo hints;
memset(&hints, 0, sizeof(hints));
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = type;
char port_str[16];
snprintf(port_str, sizeof(port_str), "%d", port);
struct addrinfo* addrs;
*getaddrinfo_error = getaddrinfo(host, port_str, &hints, &addrs);
if (*getaddrinfo_error != 0) {
return -1;
}
int result = -1;
for (struct addrinfo* addr = addrs; addr != NULL; addr = addr->ai_next) {
// The Mac doesn't have SOCK_NONBLOCK.
int s = socket(addr->ai_family, type, addr->ai_protocol);
if (s == -1 || toggle_O_NONBLOCK(s) == -1) return -1;
int rc = connect(s, addr->ai_addr, addr->ai_addrlen);
if (rc == 0) {
result = toggle_O_NONBLOCK(s);
break;
} else if (rc == -1 && errno != EINPROGRESS) {
close(s);
continue;
}
fd_set r_set;
FD_ZERO(&r_set);
FD_SET(s, &r_set);
fd_set w_set = r_set;
struct timeval ts;
ts.tv_sec = timeout;
ts.tv_usec = 0;
if ((rc = select(s + 1, &r_set, &w_set, NULL, (timeout != 0) ? &ts : NULL)) == -1) {
close(s);
break;
}
if (rc == 0) { // we had a timeout
errno = ETIMEDOUT;
close(s);
break;
}
int error = 0;
socklen_t len = sizeof(error);
if (FD_ISSET(s, &r_set) || FD_ISSET(s, &w_set)) {
if (getsockopt(s, SOL_SOCKET, SO_ERROR, &error, &len) < 0) {
close(s);
break;
}
} else {
close(s);
break;
}
if (error) { // check if we had a socket error
// TODO: Update the timeout.
errno = error;
close(s);
continue;
}
result = toggle_O_NONBLOCK(s);
break;
}
freeaddrinfo(addrs);
return result;
}
int socket_network_client(const char* host, int port, int type) {
int getaddrinfo_error;
return socket_network_client_timeout(host, port, type, 0, &getaddrinfo_error);
}